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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93ec3b4fc8b50e420d36a9e65e8c2af3cab3f9b4900edd518a885ff74ce3b79e' 
  AND token = 'rL1Fd90HU8L+UMtkbG67IqDbI95NJiAc+74V+ylAuag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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