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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2394ee2c97bf893f87bd9ee4baf02114eb69e61b9b8a69dab06825764a007f7a' 
  AND token = 'MLO84zk2OwKK4xH61JSDdPI1qevnbeugJdiPEKsaIK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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