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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ac03672448ce46d2998d916acb0cd6dd70420a57c137dc553ef4e3c5c1a65ca' 
  AND token = 'TgCuI8n7C9IAWbUt+nFkFy7d0oUIubkrYOXINiph4yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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