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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ea9bd2c0f50a1c65b7ad44aad8425fb2a8bb009ead706410822f4bfb511643f' 
  AND token = 'MFU3g728hEQfH68ivdA8aAaVc3JOKi18UmzA/J6H2+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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