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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '135f5d0ec94df1bca2af5789ad85ea6d26030edabc6b4b4d32df61f0c3b6651e' 
  AND token = 'LK5GqCEwHNAEDU+krSX8D3pcZkhAhP5dKtAuACkhcIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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