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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3843fae282c4afe5043fb6f5ed9d6aa21bd5ee641356416ba4e71e98343301d1' 
  AND token = 'jllXz36dXt0HcP7T6SyfhTODvkvJidyp5Np1+zR0U2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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