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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee64882e99efde22b6e03d2e066afc8ae9788dbc8884256627ef014349a894ee' 
  AND token = 'TSLzY/r0Qlv/I16lieqSBNO9G6komHwnl91EEVFWGTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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