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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ac974087c6e4323916d98521aa12b1a149c221f98fa472bd3bbcc31426a861f' 
  AND token = '3pyUa8aN6XA/XwjCrmEL1ddpi8eO7VKNB6Lz4I86PJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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