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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd315bb2504c4faca8fcc658fdc4b7fc61291624d993537ef98e8498f0b6e03d5' 
  AND token = 'LLwDwTKD0HSuBdMY+ct4miM+Qw+LuaOSoIptlHI4gcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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