SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ec497a2f624d828b86db1d87332b5d77fe8eaaeb0a348bb07bcb01629dfd3a2' 
  AND token = 'a63lV65YGAqQjJ4i++gnSYaZTQddvs2/elD+OjYHiMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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