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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '849e43b6a35182a0cf2a75922026bd7bb73d47ac7daa459efbdde3bfeb8bea33' 
  AND token = 'Irg2nOwGxn/v7YNE2geYerGS1U4kcqf3LrDbD+/g3yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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