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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb05d7bc2db0e028e9a094746e9c5f9c52d49c5edffc44e97892121709077663' 
  AND token = 'bl0XaCIdimfJFgG4IfYXeA25Qa8G/XE9m2MVf/Y8SJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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