SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '691123885891f451fe585329b07c328213e0c3e8505b297c519f0d15259841ac' 
  AND token = 'DLiD6uxGQJeXYG/yvuu0H3YVBTEJgCT1+4wp/vI2GGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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