SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5cb4d67fba50929015091247a332368f6ee3841ba3fd068e28ca33755315053c' 
  AND token = 'Z+VTdmXUqTOCs4J9wUk1hWm0c6auzs1KJCQ1FMphxbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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