SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c114cf2da226ff332f64d3182fc3b5890f5d27237959d627c6287ba6e09f475' 
  AND token = 'SNlP6EMFXukZJO0h3KGaKoeNK03wWluQSI0rJtYLFng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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