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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '573ae3d3cfa4177ef5cd9b4a964250ff0442363be3092616d0b6a48994735eee' 
  AND token = 'TvfHl69Xa+jnt1xtb/aAYcUSiyyn712G8Mq+4pXTxbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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