SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '427fbaa163ffeacfbcf37e51aca6985063689430f8465c5c81b57f8e4d22fa5d' 
  AND token = 'CaJBKfzq4Nz8n9HmVXuJzC7zKFxRagkjR4utrK5PnOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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