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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8efd3b1335ebc94568f4b283497248eeeeb890a3e00eb173e3af3dc7053e691c' 
  AND token = 'g9NIZwehrhROZdwe6YFhaRUj9+TCxi9TafpbyT9d+Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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