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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db4a16efcc264520cc807957cd3d49da72a5f362d82e869b3c076bb1bebdadbf' 
  AND token = 'd/8dETNYWt5Tu2OzfsV701PW7/CP7GaQGI6DAZclBCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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