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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04c00ead3cd50ec9c9b1e3d5fa16c9db24d6b71a31c16f9ef42d5f855dd98d2c' 
  AND token = 'ieU6s39Pg1LQBLF/Rmh8e30ecGMfO9j3cGAt8RX+ngM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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