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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '921cef0aeaa5413b8f5bcd682e76675ab8f4a28ecfafb8e4549dde5a87c8c5e5' 
  AND token = 'M2RBfOdVAsN+R9nRLOp2AMoZ5PVbypRC05uTttLQnzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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