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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28797a2f74d9155aac33fd8f03e092bd1cf959b199e8518a611c675986dd280e' 
  AND token = '7We5lK0BcMG7PEUN/TXD/8XVe2sMWbFrTy/yjMvX3lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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