SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10bfa24a443b49f2d1a431c9eec823d942a9d7088f0470477176fdfe2f6361f0' 
  AND token = '9++znSs0JcNQuaEQONra5ZpU0uP+pRFKL6DB7vqmziA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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