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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4c30157281da25c89c0382e9b2c7bffaa6a519ec2824fc25517a6291aa21581' 
  AND token = 'AuHYKdQVqYawxXn+g0h36mY/o5YVeleXckG8/DRWrb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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