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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28c4bda128bac713bc608acb7e5f63b42443335e013e457567ff39a4c24e83b0' 
  AND token = '2T+b55bphX9teyvKW7TuZJXW+wpmX39ou2Qe2RNm83I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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