SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30bea158af4629f560a4998870fbdd3ba026814eb57f20d870a52af30737b6c7' 
  AND token = 'tBYpjtgdaoYFUR8IvDxi4ZAttn8hmGiW02ZEBJ+r2Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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