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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '79984d3260b3c8e7411a677c0ee2a3babe76810b8ee20b9654c694b2bc3ce472' 
  AND token = 'vsjhWjJj1YXRd8Y9rESOuqdDgPosHtyWi+t6UXqlj5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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