SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac3e967937ca582c6203b3ba773fe8305ea4b9634866b9e755e52cd78c940bd5' 
  AND token = 'lFYgh/wxiSJ8wz2L6aG4m4buAoWPZ9/TuWEEB5SOrVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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