SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c563ef514be99668de447197675cac6a1161bfab25f0ce0865873865bb85e72' 
  AND token = 'ODYF2KFAZneYpg3gbGGSO0nB6xkh0l9ns/kkofdBwJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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