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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f9b62a9e4a9e37abd4669b9c73e01728d567b0ba0006d816055104f1fb92ad8' 
  AND token = 'H+E1+YFQuFTf27e74ezmRKWFLfCJQObNkpl+rohe9Jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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