SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02308d26b2fe4d6647827ba6ec07ab7c96b14491572858fa082d522b228bd6ab' 
  AND token = '5zJNyzgmAlLgP3DKL//I2sXpJUvsTZoZs/h4aMhsYt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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