SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d9e77c6abcf42552a4ae7d7f90008907489d646af50bd62ad3374ff9d095b30' 
  AND token = 'TrSqkUfW9vYdBBQ8h0zNzI0s/1xuCTfbgZ6XbPP6fxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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