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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1af5b5c91b6cc418e6e1ab8c514d0fc91c8cccaf450af8c02808ecbb7f108df' 
  AND token = 'MvtmJ5qhbTy/whPmV3Jn0kA3Kw58Ep3emiq1JzAHKHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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