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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38db5250f2f1d730719af7d71bd77b028cffa242b4829de92891e8e811c52f51' 
  AND token = '/cGcYb+7Pa8SfgnFFmJJw34REQvbAYE31AGT4BEynD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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