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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fb865c097d6fd042764493f82bce76146d84ab2b74b1e75886ff8a6c9775fda' 
  AND token = 'CTA0YjQ55HYN0FxGTW8V6dhUniugUbGIeY6mUTaVXik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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