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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d7840fc9e477c6e07fb83dcf9b22bb391760bc1ae9ca42ec13e5f9bfb973a7e' 
  AND token = 'Wth9sF4yVPfJKjHaZzTuIFP2lEfk1hfEPyuoqODVwTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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