SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f385a8a1a20efe5c69016c8d69795a67c2b7a468f2049d4b6e7707f6e76c813' 
  AND token = 's1LOBvnh+zTIb7zJN5ldDQdFluXl4giGgfzM5Pgn/P0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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