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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b5d8267d6c78fcb55fb659bc3adc0610d201d9ecb1b862c0d212ceaf098f7c7' 
  AND token = 'FIgEq9eSEV6oqVNLYZxJr2BwtlAYRWyipvqLyKMI1Ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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