SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'adeb4c781bb35ab316dc61243cd77a28d86aaf8e3e6b05250c7c5614f6054487' 
  AND token = 'ZkNykdvM/JfNJ8VTo79bmmipRjDcogZHnUGMWPHp9CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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