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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f23d2dea0a48a01b9015f8dc517d63f1736278cbfb292d80e1defd691b19873' 
  AND token = 'oOfSwH2leGBbiJqAc+jKl2Lg3/p1NMIby+CLH2jW70o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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