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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af51ea3e6d1067292218ce95bd250d59b112f156e93d3c4d9110ccdd872509c4' 
  AND token = 'qrN9ivxeF/TNi8dVCXGT5un0Nj+xoedHCCNMzqYhrdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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