SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5df3afea4f435806170f934f14edfa2091d5a9ff5b1646614f4172b038b0234' 
  AND token = 'F4OAGN3zWf3vpjE9SlXBF3FZXLbyVHoBwHb5/HQqVzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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