SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26f446912575e428b9e4cf6cb1b38efa28a67b4922d9ecab569f5efcb366dd14' 
  AND token = 'sO34vGFeIzgZV+u5SBFdXBwEATqaeuq+++atitLMuT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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