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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb057ac77154bf316f8a1bdf88a187ee98e1a5bff24afd7f564267469147e1bd' 
  AND token = 'dUrD0XY9bBx7qi/Ttt2eZ73AY9BUiaJ/QlCj7mAAAhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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