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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98a1b3cddbdc744b16af3d569e78339a01d5a387f3277ed7eac106266ca01654' 
  AND token = '39HKCh4HpJN3AdEO3rm9DPG6AOmofYD7/Hicj3eiGfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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