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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6d65c8d00b4dce46c985c4aa82caa493953f5703a8b03a2ab1809ed59f6a6f9' 
  AND token = '3TTikYCLrwNNAkra2Z/D+JqKLbMlYYZxnzrFcfAD/Dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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