Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b0d892e7928e527e9effb841657d7a55107a1363f7d59c328fec49bcf1ce2816' 
  AND token = 'LJ6uSjZ5RNXXe8QuwlPFKIVIEJSwWYsRNlRNk29CT1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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