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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '315679b3f796fb9affb0c91d1292841ee797256c826afc69e5b8d42e4631a3a2' 
  AND token = 'XB6GGMhDfkx0NH5uxUf5mOAnAZTAYAssmK363+xrUFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}