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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '32f32d0dc7f020b1bfefc837471674157e613dceb101cc09e76fe551e6e840a7' 
  AND token = 'mv3/MY4YReh4Ehc2CBKedIJTFhXxfGc0jO6Ahl98AkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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