SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '977332ec9f0e5a20ec980fa375278328e426f86ceb732e042170f418791ad45e' 
  AND token = 'GuXPI24fwBrEVmj8+2cRrYFKvDDg64WTocMfvh/0kAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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