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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '155df1d39141878405bd773532c80245ce2279e029ae83039b84fb02d1f537dc' 
  AND token = 'BJIN9vGpvC7EmLfl+cKetEFJE64o234XXIkM67tl6pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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