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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67ea9f53478f5d771a23e62fb2d299323569df69437e5c0c097184fe379ec44c' 
  AND token = '3MS8cqovHluGONkl++i5+zxOo9zrVuWl+lQ8oRVLsN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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