SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c3bd895e46101ad73bf3d9e58d4f090dfd70d2e07a74caae9b8c70fc0b289db' 
  AND token = 'MKUDTjCicb7AOFCZV/RR05j9vbMgnzBJuQ8vpQY2Yw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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