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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36dbe7b9119759317a72bf3d45398f7204d45fe0846e2e169508159f24e0d735' 
  AND token = 'dd8MlC230OToSP89p0yhBBpWggRjuhp0NgKFKtvygog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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