SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02424252881e2c17a42ea86736d81a6bf5725fa2333fa539eb96538b07195eb6' 
  AND token = 's09a2j/HBN1LdZ+z74oAxEK9iniOkS/ASLqIkQ/KJyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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