SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b69448b93cfb2eaceb3bd6f8cbc95965316198410bde7d6d50355a165af8a65d' 
  AND token = 'rMcmpMGClV2bknQggJM8lXPOP+/Va+BhTOx5zgaPy9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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