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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8d1a24e93aa4f58c0342d2620639d1962580a7889ac6a0fdbdeecd587cf5607' 
  AND token = 'G0uoyYUYbFQ3tijkG0CYfl+QM3L6WHe173ruu8uU/Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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