SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1abeca375ee85fc0aa396bc451b50f2f6af64274bd12fbe33e8b40824155e4d9' 
  AND token = 'IOPcoG3VtUVmjNvmHrTrBVDBDp1JErYv1prqVokZh8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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