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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a85a076cba5b4049567a857cf30cd281a5ba34f7bb1291b7e9b9a9a26f597012' 
  AND token = 'SNqBlcCuvvPwc1OERLU90QUHlLisD0+U47qgp0aC0yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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