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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5d574eb0438a3b29277adcd8047deaaed1d3ebb8f0a2da5af3c897ae555b250' 
  AND token = '9KdYhHRnDt9XnEbsVnIoWeO+ku8Ix5WdspeDbvme57A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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