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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fca255301693c2cd8d2cbaaaf4b31855a5fbc43834303d656c5bd939390c6c46' 
  AND token = 'udFTgh3IGBOhvSh/rFgH3L7PhHDn2bCTQR0r1Cq35kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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