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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1608e84fa9e3c48978f4642dbc3004c3b665fc52bccaeb4c615a8454772eaad3' 
  AND token = 'O2zEu2Ly+bMLVCbph9UWVDsUMlKCeX6A9UejPixFLoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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