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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ccd4a0ce63dc577d1435ee929347410d3a3625f47912b8e5770b84e82ac78112' 
  AND token = 'NV9LSfag8VwcrW2KFb2DJK0OwT+qbPr4AW06u6k9eX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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