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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '965b097e6159528865587ebc03798a7e7d8fa83e057370861e06bb1c25b6b102' 
  AND token = 'q/ud9ZviaW7KOblBkPUctU3CpWpxUMrQ/33pDwKtj2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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