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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40522a3fb332632b4b132708dff4ca539f08f6a304718c9b861bf2216a8ce777' 
  AND token = 'ieUbt4EnhPUkp92MJ01e1r135awYqWQHVQRGOSXq6Fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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